This is indeed the right way to approach this topic. Arguably religion (and more broadly, mysticism and shamanism) is the millenia-old art of cultivating positive voices inside one's head. A proto-science of mind, or the engineering practice of creating "psychotechnologies" that run on your carbon wetware.

Unfortunately, it just needs a rebranding for the 21st century, since the aesthetic of angels and demons is so hopelessly antiquated and doesn't really have the same cachet it used to.